tensorflow 图理解

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import tensorflow as tf

a = tf.constant(1, name="a")
b = tf.constant(2, name="b")
c = a + b
print(tf.get_default_graph().as_graph_def())
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node {
  name: "a"
  op: "Const"
  attr {
    key: "dtype"
    value {
      type: DT_INT32
    }
  }
  attr {
    key: "value"
    value {
      tensor {
        dtype: DT_INT32
        tensor_shape {
        }
        int_val: 1
      }
    }
  }
}
node {
  name: "b"
  op: "Const"
  attr {
    key: "dtype"
    value {
      type: DT_INT32
    }
  }
  attr {
    key: "value"
    value {
      tensor {
        dtype: DT_INT32
        tensor_shape {
        }
        int_val: 2
      }
    }
  }
}
node {
  name: "add"
  op: "Add"
  input: "a"
  input: "b"
  attr {
    key: "T"
    value {
      type: DT_INT32
    }
  }
}
versions {
  producer: 27
}